The use of ultrasound as a method for assessing changes in sensitivity to pain.
D000700:Analgesics / Q000494:pharmacology*; D001681:Biological Assay; D002986:Clinical Trials as Topic; D003061:Codeine / Q000494:pharmacology*; D006801:Humans; D010146:Pain; D010919:Placebos; D014465:Ultrasonics
D000700:Analgesics; D010919:Placebos; D003061:Codeine